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  • 1
    Electronic Resource
    Electronic Resource
    Investigation of the metal adsorbate interface of the system silver coumarin and silver hydrocoumarin by means of surface enhanced Raman spectroscopy (1998)
    Springer
    Fresenius' journal of analytical chemistry 361 (1998), S. 628-630 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Coumarin and hydrocoumarin adsorbed on silver island film were investigated by means of surface enhanced Raman spectroscopy. Polarized Raman spectra of the compounds were recorded and vibrational assignments for some characteristic Raman bands are given. The comparison of these spectra allows conclusions about the orientation of the molecule on the surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050972
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  • 2
    Electronic Resource
    Electronic Resource
    Selective generation and control of excited vibrational wave packets in the electronic ground state of K2 (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 9560-9567 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We investigate the generation and real-time monitoring of coherent vibrational wave packets in the electronic ground state of supersonic jet-cooled potassium dimers. Vibrationally excited wave packets with mean quantum numbers v¯=6 and v¯=11 are generated by a stimulated Raman process which is enhanced by an electronic resonance. Two ultrashort laser pulses of different wavelengths induce the pump and the dump process. The population of the final hot ground-state wave packets is successfully controlled by a variable time delay between the pump and the dump process, which enables us to wait with the dumping for the optimal Franck–Condon overlap between the intermediate and the predicted final vibrational wave packet in the electronic ground state. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.478921
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  • 3
    Electronic Resource
    Electronic Resource
    Resonance coherent anti-Stokes Raman spectroscopy of iodine in solution (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 2177-2187 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Coherent anti-Stokes–Raman scattering (CARS)-excitation profiles (CEPs) of the fundamental vibrational mode of I2 dissolved in cyclohexane and dibromomethane are determined with excitation wave numbers ranging from 17 000 to 23 000 cm−1. The experiments were performed at room temperature and with laser beams polarized parallel to each other. Calculations were performed for both the absorption spectrum and the CEPs of iodine in both solvents and compared with experimental results. Good qualitative agreement of the major features of the CEPs was found using gas phase potentials for the excited states 1Π1u and 3Π0+u and the ground state 1Σ+g. The excited state potential functions were slightly shifted to match the measured absorption spectra. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.472091
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  • 4
    Electronic Resource
    Electronic Resource
    Femtosecond time-resolved two-photon ionization spectroscopy of K2 (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 107 (1997), S. 9749-9754 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We investigated the coherent motion of vibrational wave packets in the |B〉 1Πu state of the potassium dimer applying two color pump/probe spectroscopy with a sub 100 fs time resolution. Special interest was paid to the ionization probe step which was analyzed carefully by varying the probe energy over a wide range. Time-dependent quantum calculations explain the experimental outcomes by introducing a nonconstant transition dipole moment between the |B〉 and the ionic state |X+〉 and by taking into account the excitation of long lived autoionizing Rydberg states. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.475271
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  • 5
    Electronic Resource
    Electronic Resource
    Resonant micro-Raman investigations of the ZnSe–LO splitting in II–VI semiconductor quantum wires (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 1446-1450 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Resonant micro-Raman spectroscopy was performed on ZnSe/Cd0.2Zn0.8Se quantum wires. The LO phonon frequencies observed for the wires were investigated as a function of the temperature and the wire width. ZnSe/Cd0.2Zn0.8Se quantum wells grown by molecular beam epitaxy were patterned by electron beam lithography and wet chemical etching to obtain quantum wires with widths down to the sub-100 nm region. The sample under investigation consisted of different areas each containing wires with well defined widths. Micro-Raman spectroscopy enabled us to perform measurements on a particular area of the sample. By this method Raman spectra could be obtained as a function of the wire width. The sample temperature was chosen to be between room temperature and 9 K. A splitting of the ZnSe and the ZnSe-like LO phonons of the ZnSe/ Cd0.2Zn0.8Se quantum wires was observed. The size of this splitting was found to depend only on the wire width and not on the temperature. This behavior is due to the strain relaxation, which occurs at the edge zone of each quantum wire. The increasing influence of the edge zone for decreasing wire width is the reason for the wire width dependence of the splitting between the ZnSe and the ZnSe-like LO phonon. As a result, the importance of partial strain relaxation for the discussion of the vibronic properties of the patterned semiconductor systems was confirmed. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364181
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  • 6
    Electronic Resource
    Electronic Resource
    Resonance effects in photoluminescence from deep traps in CdSxSe1−x doped glasses (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 3116-3119 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present photoluminescence studies on CdSxSe1−x semiconductor doped glasses with gap energies ranging from about 2 to 3 eV (400–600 nm). The investigations were performed by near-resonance as well as temperature-dependent resonance Raman spectroscopy. On the basis of the strongly resonant behavior of the deep trap photoluminescence with the excitonic states of the nanocrystallites, we have demonstrated that—besides the effect of photodarkening—inconsistencies in the experimental results of semiconductor doped glasses presented in literature, could be due to changes in the electronic resonance conditions when experimental parameters are changed. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.366555
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  • 7
    Electronic Resource
    Electronic Resource
    FT-Raman-Spectroscopic Investigations of the System Glycidoxypropyltrimethoxysilane/Aminopropyltriethoxysilane (1998)
    Springer
    Journal of sol gel science and technology 13 (1998), S. 385-390 
    Details
    ISSN: 1573-4846
    Keywords: hydrolysis ; sol-gel kinetics ; FT-Raman spectroscopy ; hybrid sol-gel materials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The base catalyzed sol-gel process in the system 3-glycidoxypropyltrimethoxysilane (GPTS)/3-aminopropyltriethoxysilane (APTS) is highly interesting for the synthesis of hybrid (inorganic-organic) polymers. FT-Raman spectroscopy with excitation in the near infrared as a versatile tool for in situ measurements was used to monitor the kinetic behavior of the hydrolysis reaction. An unexpected slow-down of the hydrolysis of GPTS recorded at higher temperatures can be attributed to a decrease of the pH-value during hydrolysis caused by silanol groups. After condensation has started, the pH-value reincreases and forces hydrolysis to reaccelerate. The results strongly suggest the existence of a pentacoordinated transition state with a negative charge at the silicon atom during base catalyzed hydrolysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008604808199
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  • 8
    Electronic Resource
    Electronic Resource
    Matrix isolation Raman spectroscopy, semiempirical calculations and normal coordinate analysis of strained systems Part I: 2,3-Diazabicyclo[2.2.1]hept-2-ene (1998)
    Springer
    Fresenius' journal of analytical chemistry 362 (1998), S. 84-90 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The Raman wavenumbers of 2,3-diazabicyclo[2.2.1]hept-2-ene (DBH), isolated in a low-temperature matrix, are presented and assignments for all vibrational fundamentals are proposed. The molecular structure of DBH is calculated by means of semi-empirical quantum-mechanics and a normal coordinate analysis of the strained bicyclic system is performed in internal coordinates using a valence force field. A detailed description of a homemade matrix isolation setup is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160051039
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  • 9
    Electronic Resource
    Electronic Resource
    Applications of the optical trapping technique to analyze chemical reactions in single emulsion particles (1996)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 355 (1996), S. 329-331 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The applicability of the single beam gradient force optical trap and the optical levitation technique to investigate dynamic processes in microparticles is examined. The device allows to follow chemical reactions, like the emulsion polymerization and the ester hydrolysis reaction, in single emulsion droplets. Furthermore the usability of optical traps to investigate living cells is demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s0021663550329
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  • 10
    Electronic Resource
    Electronic Resource
    Matrix-isolation Raman spectroscopy and photochemistry of carbonyl-metal-silyl complexes (1996)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 355 (1996), S. 340-342 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract To study the photochemistry of metal-silyl complexes the compounds Cp(CO)2Fe-SiH2(CH3) (Cp = η5–C5H5) and Cp*(CO)2((CH3)3P)Mo-SiH3 (Cp* = η5–C5(CH3)5) have been isolated in krypton or nitrogen matrices and subsequently detected by Raman spectroscopy. Vibrational assignments for the two compounds are given. Furthermore, differences in the Raman spectra induced by UV irradiation are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s0021663550340
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